Hook attachment



FIG. 1 is a top front perspective view of a hook attachment showing our new design;

FIG. 2 is a first side view thereof;

FIG. 3 is an opposite side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a hook attachment, as shown and described. 